diff --git a/src/hnswbuild.c b/src/hnswbuild.c
index 7035840..808d8e6 100644
--- a/src/hnswbuild.c
+++ b/src/hnswbuild.c
@@ -328,7 +328,7 @@ HnswElementMemory(HnswElement e, int m)
 	elementSize += sizeof(HnswNeighborArray) * (e->level + 1);
 	elementSize += sizeof(HnswCandidate) * (m * (e->level + 2));
 	elementSize += sizeof(ItemPointerData);
-	elementSize += VARSIZE_ANY(e->value);
+	elementSize += VARSIZE_ANY(DatumGetPointer(e->value));
 	return elementSize;
 }
 
diff --git a/src/hnswinsert.c b/src/hnswinsert.c
index c9414af..873be3a 100644
--- a/src/hnswinsert.c
+++ b/src/hnswinsert.c
@@ -131,7 +131,7 @@ WriteNewElementPages(Relation index, HnswElement e, int m, BlockNumber insertPag
 	BlockNumber newInsertPage = InvalidBlockNumber;
 
 	/* Calculate sizes */
-	etupSize = HNSW_ELEMENT_TUPLE_SIZE(VARSIZE_ANY(e->value));
+	etupSize = HNSW_ELEMENT_TUPLE_SIZE(VARSIZE_ANY(DatumGetPointer(e->value)));
 	ntupSize = HNSW_NEIGHBOR_TUPLE_SIZE(e->level, m);
 	combinedSize = etupSize + ntupSize + sizeof(ItemIdData);
 	maxSize = HNSW_MAX_SIZE;
diff --git a/src/hnswutils.c b/src/hnswutils.c
index ea52b7f..836e95e 100644
--- a/src/hnswutils.c
+++ b/src/hnswutils.c
@@ -325,7 +325,7 @@ HnswSetElementTuple(HnswElementTuple etup, HnswElement element)
 		else
 			ItemPointerSetInvalid(&etup->heaptids[i]);
 	}
-	memcpy(&etup->vec, DatumGetPointer(element->value), VARSIZE_ANY(element->value));
+	memcpy(&etup->vec, DatumGetPointer(element->value), VARSIZE_ANY(DatumGetPointer(element->value)));
 }
 
 /*